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54 U. S. GOVERNMENT FILMS Portuguese version "Transmissao Das Doencas" also available. (11 minutes, color) 37 The Engine Assembly U.S. Office of Education, 1945. (Automo- tive Operation and Maintenance Series. Preventive Maintenance No. 3) How to check the cylinder head and block; in- take and exhaust manifolds; under-chassis parts; valve mechanism and tappets; vents, screws, and air niters; oil filter and oil lines; and cylinder depression. Supplementary filmstrip, same title, also available. (OE 463; 19 minutes) 32, 41 Engine Change: Installation U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) Safety precautions to be observed when installing an engine; how to inspect engine mount, controls, and firewall; con- nect controls and attachments; ground- test the engine; and prepare for check flight. Supplementary filmstrip, same title, also available. (OE 273; 17 minutes) 7, 32, 41 Engine Change: Removal U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) Safety precautions to be observed when removing an engine; how to disconnect controls and attachments; remove the engine; and inspect the mount, firewall, and controls. Supplementary filmstrip, same title, also available. (OE 272; 17 minutes) 7, 32, 41 Engine Reassembly. Pan 1 U.S. Department of the Navy, 1944. (Cooper Bessemer Diesel Engine Main- tenance Series) How to reassemble; in- spect liner; seat seal in position in cylinder block; lower liner and fit piston into liner; put shell into connecting-rod bearing; and install the connecting-rod bearing cap. (MN 2364-j; 15 minutes) . 41 Engine Reassembly. Part 2 U.S. Department of the Navy, 1944. (Cooper Bessemer Diesel Engine Main- tenance Series) How to install fire gasket, liner, cylinder nuts, motor header flange, and liner drain plug, exhaust manifold gasket and cover-frame, lube oil lines, injector nozzle, air starting and fuel lines; adjust valve clearances; and install cylinder head cover. (MN 2364-k; 18 minutes) 41 Engine Reassembly. Part 3 U.S. Department of the Navy, 1944. (Cooper Bessemer Diesel Engine Main- tenance Series) How to secure exhaust manifold; install indicator cock and relief valve unit; secure air starting manifold and supply line; remove coup- ling gear; close indicator cocks; and tighten wrist pin bolt. (MN 2364-e; 15 minutes) 41 Engine Tests and Tune Up U.S. Office of Education, 1945. (Automo- tive Operation and Maintenance Series. Preventive Maintenance No. 5) How to adjust the automatic choke; check and adjust ignition, valve tappets, and car- buretor; and make vacuum gage tests. Supplementary filmstrip, same title, also available. (OE 465; 18 minutes) 32, 41 Environmental Sanitation U.S. Institute of Inter-American Affairs, 1946. (Health for the Americas Series) How sanitary facilities and practices pro- tect the health and lives of people living in crowded cities. Why sanitary disposal of sewage and garbage, protection of food, milk and water and general clean- liness of people and places is necessary. Animated cartoon. Portuguese version "Saneamento Geral" and Spanish version "Saneamiento Del Ambiente" also avail- able. (8 minutes, color) 32, 37 Epidemiology of Influenza U.S. Public Health Service, 1950. His- torical significance of disease, clinical